Al-Adab Al-Mufrad #1047
Greetings
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ، قَالَ: حَدَّثَنَا عِيسَى بْنُ يُونُسَ، عَنْ عَنْبَسَةَ قَالَ: رَأَيْتُ ابْنَ عُمَرَ يُسَلِّمُ عَلَى الصِّبْيَانِ فِي الْكُتَّابِ.
'Anbas said, "I saw Ibn 'Umar greet children in the schools."
About Al-Adab Al-Mufrad
This hadith is #1047 from Al-Adab Al-Mufrad, in the Book of Greetings.